Azaezl
Fishaholic
The java or the moss balls? Moss balls need hardly any light, it's a type of algae so will survive under very low light conditions, the moss balls / caves I had in the frog tank survived with just a cheap table lamp for light for a good few months. The java was only in there for about 3 weeks, if you have £20(or thereabouts) you could get an arcadia arc pod which will suit low light plants very well.